Preparing The Burner Body and The Choke Sleeve

The burner body is a 3/4"x 10" pipe that is cut from a 3/4"x 24" pipe (we have enough pipe left over for a second burner, eh!?).  We polished the outside of the pipe with emery cloth to remove the black finish.  The inside diameter is 3/4" and we have bored it out to 7/8" with a ream. 

We next have to cut three evenly-spaced slots at the threaded end of the burner body which will allow sufficient air to be injected so as to create a very flame.  Each slot will be 5/16" wide and 2 1/2" long.  In order to get the equal spacing around the tube, we need to determine the circumference of the pipe.  We wrap some duct tape around the pipe and cut the tape.  Next we peel the duct tape from the pipe and spread it out on the table.  Using a pair of calipers, we determine that the circumference is 3.117".  Divided by 3 gives us 1.04".  We next mark off this distance from each end of the tape and on both sides. 

We wrap the marked duct tape back onto the pipe and scribe the marks onto the circumference of the pipe.  We next fill the distance on each mark with black magic marker.  This will allow us to better see the lines we will scribe on the pipe between the two lines.